/*
 * Copyright 2017 StreamSets Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.streamsets.pipeline.stage.origin.tcp;

import com.google.common.base.Charsets;
import com.streamsets.pipeline.api.Config;
import com.streamsets.pipeline.api.StageException;
import com.streamsets.pipeline.api.StageUpgrader;
import com.streamsets.pipeline.api.impl.Utils;

import java.util.List;

public class TCPServerSourceUpgrader implements StageUpgrader {
  @Override
  public List<Config> upgrade(
      String library,
      String stageName,
      String stageInstance,
      int fromVersion,
      int toVersion,
      List<Config> configs
  ) throws StageException {
    switch (fromVersion) {
      case 1:
        upgradeV1ToV2(configs);
        if (toVersion == 2) {
          break;
        }
        // fall through
      case 2:
        upgradeV2ToV3(configs);
        if (toVersion == 3) {
          break;
        }
        // fall through
      case 3:
        upgradeV3ToV4(configs);
        break;
      default:
        throw new IllegalStateException(Utils.format("Unexpected fromVersion {}", fromVersion));
    }

    return configs;
  }

  private void upgradeV1ToV2(List<Config> configs) {
    configs.add(new Config("conf.lengthFieldCharset", Charsets.UTF_8.name()));
  }

  private void upgradeV2ToV3(List<Config> configs) {
    configs.add(new Config("conf.readTimeout", 300));
  }

  private void upgradeV3ToV4(List<Config> configs) {
    if (configs.removeIf(config -> "conf.readTimeout".equals(config.getName()) &&
        ((int) config.getValue() <= 0 || (int) config.getValue() > 3600))) {
      configs.add(new Config("conf.readTimeout", 3600));
    }
  }

}
